const formatTime = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}

const formatTime2 = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return [year, month].map(formatNumber).join('-')
}
const formatNumber = n => {
  n = n.toString()
  return n[1] ? n : '0' + n
}
/**
 * 日期格式化
 * @param {Object} date
 * @param {Object} fmt
 */
function dateFormat(date, fmt) {
  if (!date) {
    return
  }
  if (!fmt) {
    fmt = 'yyyy-MM-dd hh:mm'
  }
  if (!(date instanceof Date)) {
    date = new Date(typeof date == 'number' ? date : date.replace(/-/g, '/'))
  }

  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length));
  }

  let o = {
    'M+': date.getMonth() + 1,
    'd+': date.getDate(),
    'h+': date.getHours(),
    'm+': date.getMinutes(),
    's+': date.getSeconds()
  };

  for (let k in o) {
    if (new RegExp(`(${k})`).test(fmt)) {
      let str = o[k] + '';
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? str : ('00' + str).substr(str.length));
    }
  }
  return fmt;
}


module.exports = {
  formatTime: formatTime,
  formatTime2: formatTime2,
  dateFormat
}